How do you replace thermostat on 1995 Geo Tracker?

Answer 1

You don't technically have to FULLY drain the radiator, some say its easier but for me its just more anti-freeze to buy. First drain the radiator so you have around 3-4inches gone from the top, this is so when you take the thermostat housing off it water doesn't flow everywhere.

Next unbolt the thermstat housing and the pipe that connects it, set the metal hosing aside and remove the thermostat. Make sure all area's are clean of old gasket beforehand, as even a small piece can cause some problems regarding leakage. Next is place the thermostat into the hole that you removed the old one from, be sure that the pressure relief (small brass tab on the thermostat) is facing the engine, then replace with new gasket/seals and bolt the housing back into place along with radiator pipes.

Fill radiator with anti-freeze (you won't use much if you didn't full drain the radiator, and after that you're good to go.